EP0959583A2 - System for optimising data transmission over a bidirectional radio channel - Google Patents

System for optimising data transmission over a bidirectional radio channel Download PDF

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Publication number
EP0959583A2
EP0959583A2 EP99103440A EP99103440A EP0959583A2 EP 0959583 A2 EP0959583 A2 EP 0959583A2 EP 99103440 A EP99103440 A EP 99103440A EP 99103440 A EP99103440 A EP 99103440A EP 0959583 A2 EP0959583 A2 EP 0959583A2
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EP
European Patent Office
Prior art keywords
data
data transmission
station
transmission protocol
düp
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99103440A
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German (de)
French (fr)
Inventor
Werner Dirschedl
Rainer Riek
Günter Greiner
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Rohde and Schwarz GmbH and Co KG
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Rohde and Schwarz GmbH and Co KG
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Application filed by Rohde and Schwarz GmbH and Co KG filed Critical Rohde and Schwarz GmbH and Co KG
Publication of EP0959583A2 publication Critical patent/EP0959583A2/en
Withdrawn legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0078—Avoidance of errors by organising the transmitted data in a format specifically designed to deal with errors, e.g. location
    • H04L1/0083—Formatting with frames or packets; Protocol or part of protocol for error control

Definitions

  • the invention relates to and is based on an arrangement according to the preamble of Main claim.
  • DÜP Prepare data transfer protocol
  • DÜPHE Data transmission protocol
  • TCP / IP Transmission Control Protocol / Internet Protocol
  • bit error rate to be measured at the receiving end and transmitted back to the transmitter, where it is dependent thereof to change the length of the data packets accordingly (older patent application 196 51 593.9).
  • Data transfer protocol of the higher level e.g. TCP / IP (DÜPHE)
  • DÜPHE Data transfer protocol of the higher level
  • the DÜP before sending the data packets DÜPHE data packet identifiers i.e. the number and / or length and / or priority and / or type of the data packets are determined and the Length of the DÜP data packets set.
  • the most diverse Possible combinations for these data packet identifiers In the simplest case it may be sufficient to add only the current or expected number of data packets determine. The adjustment will be better if the current or too is added expected length of the data packets of the data to be transmitted as an identifier is taken into account.
  • a Another identifier can be the current status of the DÜPHE data packets, for example the information that it is a repeat package. This quantitative recording of the data packet identifiers takes place on both sides of the Radio link and from these identifiers the parameters of the Data transfer protocol DÜP in the sense of optimal use of the Radio channel capacity can be set. It has proven to be particularly advantageous proven to influence the length of the data packets accordingly and thus the Frequency with which you switch between the two directions of the radio channel.
  • the invention is based on a schematic drawing of a Embodiment explained in more detail.
  • the figure shows the basic circuit diagram of a bidirectional short-wave connection between a send / receive station A and a send / receive station B.
  • Die zu digital data are transmitted by a data transmission protocol (DÜPHE) e.g. TCP / IP divided into individual packets, which are successively via a radio driver RA the data transmission protocol DÜP of the actual transmitter of station A fed and transmitted over the radio channel to remote station B and in the receiver there whose DÜP are evaluated.
  • DÜPHE data transmission protocol
  • RA data transmission protocol of the actual transmitter of station A fed and transmitted over the radio channel to remote station B and in the receiver there whose DÜP are evaluated.
  • the digital data to be transmitted are processed and via a radio driver RB the DÜP of sending the station B and via the radio channel to station A transfer.
  • the packets generated by the DÜP can differ, for example put together a variable number of frames, the number of frames per package can depend on the quality of the radio connection and for example between 1 and 15 lie.
  • Each frame can in turn consist of a 5-byte header, for example Control and control information, a subsequent example between 4 and 250 bytes of data and a redundancy code of 2 bytes, for example (CRC) exist.
  • CRC redundancy code
  • the number, length, priority or type (control or Control information, data information, receipts etc.) determined and depending on The DÜP data transmission protocol, with which the to transmitting data packets before they are sent via the transmitter of station A. once divided into individual data packets, set accordingly.
  • the DÜP data transmission protocol with which the to transmitting data packets before they are sent via the transmitter of station A. once divided into individual data packets, set accordingly.
  • Running in the radio driver e.g. some long packets of a few kilobytes, for example, the DÜP packets are extended as far as the data volume of the Allow remote station and the current channel quality.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Data Exchanges In Wide-Area Networks (AREA)

Abstract

In each transmitting and receiving station (A,B) data is divided into packets in accordance with a transmission protocol and the number, length, priority and type (payload, control) of each packet is determined. The data transmission protocol is selected accordingly for optimal usage of the channel capacity.

Description

Die Erfindung betrifft und geht aus von einer Anordnung laut Oberbegriff des Hauptanspruches.The invention relates to and is based on an arrangement according to the preamble of Main claim.

Zur Übertragung von digitalen Daten, wie digitalisierte Sprache oder andere digitale Informationen über einen in beiden Übertragungsrichtungen (bidirektionalen) Kurzwellen-Funkkanal ist es bekannt, die zu übertragenden digitalen Daten, die abwechselnd in Hin- und Rückrichtung über den Funkkanal übertragen werden, nach einem vorgegebenen Datenübertragungsprotokoll, im folgenden DÜP genannt, aufzubereiten und dabei in einzelne Datenpakete aufzuteilen (z.B. nach A.S. Tanenbaum, Computer Networks, Prentice-Hall, Englewood Cliffs, 1981, Seiten 136 ff). Dabei können diese zu übertragenden digitalen Daten auch schon vorher in einer höheren Ebene nach einem anderen Datenübertragungsprotokoll, im folgenden DÜPHE genannt, aufbereitet sein, beispielsweise nach dem bekannten TCP/IP (Transmission Control Protocol/Internet Protocol)-Protokoll. Zum Optimieren der Datenübertragung über einen solchen bidirektionalen Funkkanal wurde auch schon vorgeschlagen, die Bitfehlerrate empfangsseitig zu messen und an den Sender zurückzuübertragen und dort in Abhängigkeit davon u.a. die Länge der Datenpakete entsprechend zu ändern (ältere Patentanmeldung 196 51 593.9).For the transmission of digital data, such as digitized speech or other digital Information about a short-wave radio channel in both transmission directions (bidirectional) it is known the digital data to be transmitted, which alternate in and out Direction can be transmitted over the radio channel, according to a predetermined Prepare data transfer protocol, hereinafter referred to as DÜP, and thereby in split individual data packets (e.g. according to A.S. Tanenbaum, Computer Networks, Prentice-Hall, Englewood Cliffs, 1981, pages 136 ff). In doing so, these can transmitting digital data even earlier in a higher level after one another data transmission protocol, hereinafter referred to as DÜPHE, must be prepared, for example, according to the well-known TCP / IP (Transmission Control Protocol / Internet Protocol) protocol. To optimize the data transmission via one bidirectional radio channel has also been proposed, the bit error rate to be measured at the receiving end and transmitted back to the transmitter, where it is dependent thereof to change the length of the data packets accordingly (older patent application 196 51 593.9).

Je nach Art der zu übertragenden digitalen Daten und des diese aufbereitenden Datenübertragungsprotokolls der höheren Ebene, z.B. TCP/IP (DÜPHE), können die anfallenden Datenpakete und Quittungen in beiden Übertragungsrichtungen sehr unterschiedliche Länge und Häufigkeit aufweisen und es kann damit selbst bei Anwendung der erwähnten Optimierung der Datenübertragung mit dem DÜP zu erheblichen Beeinträchtigungen des Datendurchsatzes kommen. Depending on the type of digital data to be transmitted and the data that is processed Data transfer protocol of the higher level, e.g. TCP / IP (DÜPHE), can resulting data packets and receipts in both directions of transmission very vary in length and frequency and can therefore be used even when used the aforementioned optimization of data transmission with the DÜP to considerable Impairment of data throughput come.

Es ist daher Aufgabe der Erfindung, eine Anordnung zum Optimieren der Datenübertragung über einen bidirektionalen Funkkanal zu schaffen, bei der die zur Verfügung stehende bidirektionale Kanalkapazität jeweils an die in beiden Richtungen anfallenden Datenaufkommen optimal angepaßt ist.It is therefore an object of the invention to provide an arrangement for optimizing the To create data transmission over a bidirectional radio channel, in which the for Available bidirectional channel capacity to each in both directions resulting data volume is optimally adapted.

Diese Aufgabe wird ausgehend von einer Anordnung laut Oberbegriff des Hauptanspruches durch dessen kennzeichnende Merkmale gelöst. Vorteilhafte Weiterbildungen ergeben sich aus den Unteransprüchen.This task is based on an arrangement according to the preamble of Main claim solved by its characteristic features. Beneficial Further training results from the subclaims.

Gemäß der Erfindung werden vor der Aussendung der Datenpakete der DÜP die Datenpaketkennungen der DÜPHE laut Hauptanspruch, also die Anzahl und/oder Länge und/oder Priorität und/oder Art der Datenpakete ermittelt und in Abhängigkeit davon die Länge der Datenpakete der DÜP eingestellt. Dabei sind die verschiedenartigsten Kombinationsmöglichkeiten für diese Datenpaketkennungen denkbar. Im einfachsten Fall kann es ausreichen, nur die momentane bzw. zu erwartende Anzahl der Datenpakete zu ermitteln. Besser wird die Anpassung, wenn zusätzlich auch noch die momentane bzw. zu erwartende Länge der Datenpakete der zu übertragenden Daten als Kennung mit berücksichtigt wird. Noch besser ist es, auch noch die momentane bzw. zu erwartende Priorität der vom DÜPHE in das DÜP einlaufenden Datenpakete zu ermitteln bzw. die momentane bzw. zu erwartende Art (Information, Quittung, Steuerbefehle od.dgl.). Eine weitere Kennung kann die jeweilige Aktualität der Datenpakete der DÜPHE sein, beispielsweise die Information darüber, daß es sich um ein Wiederholungspaket handelt. Diese quantitative Erfassung der Datenpaketkennungen erfolgt auf beiden Seiten der Funkstrecke und aus diesen Kennungen können dann die Parameter des Datenübertragungsprotokolls DÜP im Sinne einer optimalen Nutzung der Funkkanalkapazität eingestellt werden. Als besonders vorteilhaft hat es sich dabei erwiesen, die Länge der Datenpakete entsprechend zu beeinflussen und damit auch die Häufigkeit, mit der zwischen den beiden Richtungen des Funkkanals umgeschaltet wird.According to the invention, the DÜP before sending the data packets DÜPHE data packet identifiers according to the main claim, i.e. the number and / or length and / or priority and / or type of the data packets are determined and the Length of the DÜP data packets set. Here are the most diverse Possible combinations for these data packet identifiers. In the simplest case it may be sufficient to add only the current or expected number of data packets determine. The adjustment will be better if the current or too is added expected length of the data packets of the data to be transmitted as an identifier is taken into account. It is even better to include the current or expected one To determine the priority of the data packets arriving from the DÜPHE or the current or expected type (information, receipt, control commands or the like). A Another identifier can be the current status of the DÜPHE data packets, for example the information that it is a repeat package. This quantitative recording of the data packet identifiers takes place on both sides of the Radio link and from these identifiers the parameters of the Data transfer protocol DÜP in the sense of optimal use of the Radio channel capacity can be set. It has proven to be particularly advantageous proven to influence the length of the data packets accordingly and thus the Frequency with which you switch between the two directions of the radio channel.

Die Erfindung wird im folgenden anhand einer schematischen Zeichnung an einem Ausführungsbeispiel näher erläutert. The invention is based on a schematic drawing of a Embodiment explained in more detail.

Die Figur zeigt das Prinzipschaltbild einer bidirektionalen Kurzwellenverbindung zwischen einer Sende/Empfangs-Station A und einer Sende/Empfangs-Station B. Die zu übertragenden digitalen Daten werden durch ein Datenübertragungaprotokoll (DÜPHE) z.B. TCP/IP in einzelne Pakete aufgeteilt, die nacheinander über einen Radiotreiber RA dem Datenübertragungsprotokoll DÜP des eigentlichen Senders der Station A zugeführt und über den Funkkanal zur Gegenstation B übertragen und im dortigen Empfänger mit dessen DÜP ausgewertet werden. Im Sendebetrieb der Gegenstation B werden in gleicher Weise die zu übertragenden digitalen Daten aufbereitet und über einen Radiotreiber RB dem DÜP des Senden der Station B zugeführt und über den Funkkanal zur Station A übertragen. Die jeweils von den DÜP erzeugten Pakete können sich beispielsweise aus einer variablen Anzahl von Rahmen zusammensetzen, die Anzahl der Rahmen pro Paket kann von der Güte der Funkverbindung abhängen und beispielsweise zwischen 1 und 15 liegen. Jeder Rahmen kann seinerseits aus einem beispielsweise 5 Byte langen Header aus Kontroll- und Steuerinformationen, einem anschließenden beispielsweise zwischen 4 und 250 Byte langem Datenanteil und einem beispielsweise 2 Byte langen Redundanzcode (CRC) bestehen. Durch Wahl der Datenmenge je Rahmen und Wahl der Anzahl der Rahmen in einem Paket kann somit senderseitig in jeder Station A und B die Paketlänge des DÜP beliebig, beispielsweise zwischen 64 Byte und 8 kByte gewählt werden.The figure shows the basic circuit diagram of a bidirectional short-wave connection between a send / receive station A and a send / receive station B. Die zu digital data are transmitted by a data transmission protocol (DÜPHE) e.g. TCP / IP divided into individual packets, which are successively via a radio driver RA the data transmission protocol DÜP of the actual transmitter of station A fed and transmitted over the radio channel to remote station B and in the receiver there whose DÜP are evaluated. In transmission mode of the opposite station B are in the same The digital data to be transmitted are processed and via a radio driver RB the DÜP of sending the station B and via the radio channel to station A transfer. The packets generated by the DÜP can differ, for example put together a variable number of frames, the number of frames per package can depend on the quality of the radio connection and for example between 1 and 15 lie. Each frame can in turn consist of a 5-byte header, for example Control and control information, a subsequent example between 4 and 250 bytes of data and a redundancy code of 2 bytes, for example (CRC) exist. By choosing the amount of data per frame and choosing the number of The frame in a packet can thus be the packet length in each station A and B on the transmitter side of the DÜP, for example between 64 bytes and 8 kbytes.

Von den aus den DÜPHE in den Radiotreiber RA bzw. RB einlaufenden Datenpaketen wird nun die Anzahl, die Länge, die Priorität bzw. die Art (Kontroll- oder Steuerinformation, Dateninformation, Quittungen etc.) ermittelt und in Abhängigkeit von diesen Kenngrößen wird das Datenübertragungsprotokoll DÜP, mit dem die zu übertragenden Datenpakete vor ihrem Aussenden über den Sender der Station A noch einmal in einzelne Datenpakete aufgeteilt werden, entsprechend eingestellt. Wird beispielsweise in dem Radiotreiber RA eine Anzahl von zu übertragenden kurzen Datenpaketen von z.B. 100 Byte festgestellt, so wird die Länge der über das Datenübertragungsprotokoll DÜP erzeugten Datenpakete auf diese Länge eingestellt. Laufen in den Radiotreiber z.B. einige lange Pakete von beispielsweise einigen Kilobyte, so werden die Pakete DÜP so weit verlängert, wie es das Datenaufkommen der Gegenstation und die momentane Kanalqualität erlauben.Of the data packets arriving from the DÜPHE into the radio driver RA or RB the number, length, priority or type (control or Control information, data information, receipts etc.) determined and depending on The DÜP data transmission protocol, with which the to transmitting data packets before they are sent via the transmitter of station A. once divided into individual data packets, set accordingly. Becomes for example in the radio driver RA a number of short ones to be transmitted Data packets from e.g. 100 bytes determined, so the length of the over Data transmission protocol DÜP generated data packets set to this length. Running in the radio driver e.g. some long packets of a few kilobytes, for example, the DÜP packets are extended as far as the data volume of the Allow remote station and the current channel quality.

Claims (5)

Anordnung zum Optimieren der Datenübertragung über einen bidirektionalen Funkkanal, bei der in jeder der beiden Sende/Empfangs-Stationen die zu sendenden digitalen Daten nach einem Datenübertragungsprotokoll in einzelne Datenpakete aufgeteilt werden,
dadurch gekennzeichnet, daß in jeder Sende/Empfangs-Station (A bzw. B) die Anzahl und/oder die Länge und/oder die Priorität und/oder die Art (z.B. Information, Kontroll/Steuerungszeichen, Wiederholungsblöcke) der durch das Datenübertragungsprotokoll der höheren Ebene (DÜPHE) erzeugten und zum jeweiligen Sender der Station übertragenen Datenpakete bestimmt wird (Datenpaketkennungen) und in Abhängigkeit davon das Datenübertragungsprotokoll (DÜP) in mindestens einer der Stationen im Sinne einer optimalen Nutzung der Funkkanalkapazität gewählt wird. Arrangement for optimizing the data transmission over a bidirectional radio channel, in which the digital data to be transmitted are divided into individual data packets in each of the two transmitting / receiving stations according to a data transmission protocol,
characterized, that in each transmitting / receiving station (A or B) the number and / or the length and / or the priority and / or the type (e.g. information, control / control characters, repetition blocks) of the data packets generated by the data transmission protocol of the higher level (DÜPHE) and transmitted to the respective transmitter of the station (data packet identifiers) and, depending on this, the data transmission protocol (DÜP) in at least one of the stations is selected in the sense of optimal use of the radio channel capacity. Anordnung nach Anspruch 1,
dadurch gekennzeichnet, daß in Abhängigkeit von den Datenpaketkennungen jeweils die Länge der durch das Datenübertragungsprotokoll (DÜP) erzeugten Datenpakete bestimmt wird. Arrangement according to claim 1,
characterized, that the length of the data packets generated by the data transmission protocol (DÜP) is determined depending on the data packet identifiers. Anordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß in der einen Station (z.B. A) die Datenpaketkennungen bestimmt werden und in Abhängigkeit davon die Datenpaketlänge in der gleichen Station (z.B. A) im Sinne einer optimalen Funkkanalkapazitätsnutzung bestimmt wird. Arrangement according to claim 1 or 2,
characterized, that the data packet identifiers are determined in one station (for example A) and the data packet length in the same station (for example A) is determined as a function of optimum radio channel capacity utilization. Anordnung nach Anspruch 1 oder 2,
dadurch gekennzeichnet, daß die in der einen Station (z.B. A) bestimmten Datenpaketkennungen zur Gegenstation (z.B. B) übertragen werden und dort zur Beeinflussung der Datenpaketlänge des Datenübertragungsprotokolls (DÜP) benutzt werden. Arrangement according to claim 1 or 2,
characterized, that the data packet identifiers determined in one station (eg A) are transmitted to the opposite station (eg B) and are used there to influence the data packet length of the data transmission protocol (DÜP). Anordnung nach einem der vorhergehenden Ansprüche,
dadurch gekennzeichnet, daß die in den beiden Stationen (A und B) bestimmten Datenpaketkennungen zur jeweiligen Gegenstation übertragen werden und dort zur Einstellung der Länge der Datenpakete des Datenübertragungsprotokolls (DÜP) benutzt werden. Arrangement according to one of the preceding claims,
characterized, that the data packet identifiers determined in the two stations (A and B) are transmitted to the respective opposite station and are used there to set the length of the data packets of the data transmission protocol (DÜP).
EP99103440A 1998-02-25 1999-02-23 System for optimising data transmission over a bidirectional radio channel Withdrawn EP0959583A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19807931A DE19807931A1 (en) 1998-02-25 1998-02-25 Digital data transmission optimization arrangement for bidirectional short wave radio channel
DE19807931 1998-02-25

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EP0959583A2 true EP0959583A2 (en) 1999-11-24

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EP99908947A Expired - Lifetime EP1058981B1 (en) 1998-02-25 1999-02-25 Arrangement for optimizing the data transmission over a bidirectional radio channel

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US (1) US6922401B1 (en)
EP (2) EP0959583A2 (en)
DE (2) DE19807931A1 (en)
WO (1) WO1999044325A1 (en)

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Also Published As

Publication number Publication date
DE19807931A1 (en) 1999-08-26
WO1999044325A1 (en) 1999-09-02
US6922401B1 (en) 2005-07-26
DE59905328D1 (en) 2003-06-05
EP1058981B1 (en) 2003-05-02
EP1058981A1 (en) 2000-12-13

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